Quarterly Technical Report, October 2000
During the past three months we designed a robust contributory key agreement protocol based on Group Diffie Helman CLIQUES and proved its correctness.
This algorithm will be implemented in the Secure Spread Version 1 system.
We also finalized the version of Secure Spread Version 0.
We continued the design and development of a many-to-many flow control algorithm for wide area multicast.
We have done some validation experiments using ns as well as some preliminary actual experiments using the CAIRN network. This work is continuing.
We have started to define the necessary services for practical secure group comunication in particular and for overlay networks in general.
We look beyond the key agreement protocols into authentication and access control.
This work is now shaping up.
We have released Spread 3.13 in August. The main new features of this
Although we did not release Secure Spread Version 0 during this quarter, it is worthwhile to mention that the system is ready to be released pending some licensing issues. We plan to release it during November 2000, according to planed schedule.
- Scalability improvements in the number of groups in the system. The lightweight group management is now using probablistic algorithms that reduce
group lookups to complexity of o(log(n)) down from o(n).
This allows us to support tens of thousands of groups without noticable performance penalty.
Our system is still limited to about 1000 groups due to state transfer implementation limitation.
- Performance improvements for small messages (by a factor of 4 or so).
- A new configuration format that allows improved run time configuration.
We know of one Dynamic Coaltions project that already uses our software: This is the Efficient and Scalable Infrastructure Support project done at Johns Hopkins and Brown, which aims to provide scalable certification service.
Plans for Next Quarter:
- The release of Secure Spread Version 0 in November.
- Continued testing and evaluation of Secure Spread Version 1.
- Investigating practical authentication and access control for group communication in particular and overlay networks in general.
- Continued research into high performance wide area group communication.
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Distributed Systems and Networks Lab|
Computer Science Department
Johns Hopkins University
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Baltimore, MD 21218-2686